Just as an FYI, if it hasn't been mentioned before but you can setup the side action button on the Ultra to launch Workoutdoors via a shortcut.
On your iPhone, open Shortcuts and create a new shortcut. The only action needed is "Open App" and then select Workoutdoors. Once done, make sure you sync this new shortcut to the Ultra. Once that is done, just open settings on the Ultra, and then open Action Button. Select Shortcut, then select the shortcut you created. Once done, you can press the action button to launch Workoutdoors.
- A couple of small limitations. You can only use the action button/shortcut to launch the app...not a specific activity.
- When you press the action button, you will see for a second, a big shortcut screen for a second, then the app opens.
It's a decent workaround for now, till we get native support for the action button, in the app.